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23. Radiolaria from the North Pacific, Deep Sea Drilling Project, Leg 32

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23. Radiolaria from the North Pacific, Deep Sea Drilling Project, Leg 32 23. RADIOLARIA FROM THE NORTH PACIFIC, DEEP SEA DRILLING PROJECT, LEG 32 Helen P. Foreman, Oberlin College, Oberlin, Ohio CONTENTS Introduction 579 Ranges of Radiolaria 594 Presentation of results 579 List of events with Tables 9 and 10 594 Radiolaria from each Site 580 Explanation of correlation and Radiolaria from Site 303 with Table 1 580 range charts with Figures 3, 4, and 5 607 Radiolaria from Site 304 with Table 2 581 Systematic Section 607 Radiolaria from Site 305 with Table 3 581 Cretaceous 607 Radiolaria from Site 306 with Table 4 583 Cenozoic 618 Radiolaria from Site 307 with Table 5 584 Acknowledgments 622 Radiolaria from Site 310 with Tables 6 and 585 References 622 Radiolaria from Site 313 with Table 8 585 Explanation of Plates with Synchronopticon 625 Radiolarian Zones 586 Plates 1A-1D, 1F-1H, and 2C-2L; and Cretaceous zonation with Figure 1 586 other Plates 3-9. Early Eocene zonation 591 Index 674 Neogene zonation with Figure 2 591 INTRODUCTION PRESENTATION OF RESULTS Radiolaria were recovered from 7 of the 10 sites in- As stated above, the main body of this chapter con- vestigated on DSDP Leg 32. Their localities are as cerns the Cretaceous Radiolaria. With the exception of follows: the Late Cretaceous Radiolaria at Site 313, the Cre- Site 303—40°48.50'N, 154°27.07'E; water depth 5609 taceous Radiolaria selected for study have been de- meters. scribed, tabulated at each site, their upper and lower Site 304—39°20.27'N, 155°04.19'E; water depth 5630 limits arranged in an events list, and their ranges pre- meters. sented in a chart. A synchronopticon comprising 17 Site 305—32°OO.13'N, 157°51.00'E; water depth 2903 plates illustrates in horizontal rows species which co- meters. occur, and in vertical rows species ranges and evolu- Site 306—31°52.02'N, 157°28.71'E; water depth 3399 tionary relationships. meters. For the Paleogene and Neogene Radiolaria, only a Site 307—28°35.26'N, 161°00.28'E; water depth 5696 few species have been described. In general, the meters. Systematic Section gives only references to papers where Site 310—36°52.11'N, 176°54.09'E; water depth 3516 the species mentioned are fully described or which con- meters. tain more complete synonymies. For the Paleogene at Site 313—20°10.52'N, 17O°57.15'W; water depth Site 313, selected species are tabulated, and a list of 3484 meters. events compares the Leg 32 sequence with that found on Sites 305 and 306 were drilled on the Shatsky Rise, Leg 10 in the Gulf of Mexico. For the Neogene, the Site 310 on Hess Rise, and Site 313 in a basin of the Radiolaria in the long sequence at Site 310 have been Mid-Pacific mountains. The remaining sites, 303, 304, tabulated. A range chart presents these results. and 307, were drilled at abyssal depths. Unless otherwise stated, ranges are considered to be Radiolaria were recovered in significant amounts as morphological. follows: Early Cretaceous, Sites 303-307; Late In the Systematic Section families are arranged alpha- Cretaceous, Site 303, 307, 310, and 313; Paleogene, Site betically within the orders Spumellaria and Nassellaria 313; Neogene, Sites 303-306 and 310. and species are arranged alphabetically under each fami- The long sequences of Cretaceous Radiolaria fre- ly. This order is maintained on the tabulation tables. quently co-occurring with calcareous fossils are of con- For a variety of reasons (paucity of forms, unreliability siderable significance, and the main body of this report of information, etc.), some of these species are not in- concerns these Cretaceous occurrences. cluded on the range charts where the species are ar- Also investigated but with less detail are the early ranged according to age. In order to facilitate finding a Eocene Radiolaria at Site 313 and the Neogene oc- species on these charts and to indicate when they have currences, with particular emphasis on the long se- been omitted, the species have been numbered con- quence at Site 310. secutively on the range charts and these numbers are 579 H. P. FOREMAN given, along with the descriptions, in the Systematic Sec- below the range of the Hays (1970) zonation for the tion and in the list of events. North Pacific and the age determination is made on the The following abbreviations are used on the tables basis of the Riedel and Sanfilippo (1971) equatorial which record the relative abundance and the quality of zonation: Core 3 is late Miocene, {Stichocorys peregrina preservation of the Radiolaria in each sample: A, abun- Zone) and Core 4 is mid-Miocene (Cannartus petters- dant; C, common; F, few; and R, rare; G, good; M, sonii Zone). moderate; and P, poor. The abundances for individual species are indicated as Cretaceous follows: Samples of both pelagic clay and chert were exam- For the Cenozoic, where there are generally more ined. In general, the Radiolaria are better preserved in recognizable species on a slide: C, common, more than the chert and, unless otherwise stated, age assignments 29 specimens on a slide; F, few, 10-29 specimens; R, 3-9 have been made from these samples. specimens; +, 1-2 specimens; , a single isolated Radiolaria were recovered from Core 5 in Hole 303 specimen. and Cores 1A-8A in Hole 303A, and age assignments For the Cretaceous, where preservation is such that are made on the basis of correlations with radiolarian there are frequently fewer individuals and among them events in Holes 305 and 306 which have calcareous fossil fewer recognizable forms than in the Cenozoic: C, com- control (see Figure 1). No other siliceous fossils were mon, more than 19 specimens on a slide; F, few, 6-19 observed. specimens; R, 2-5 specimens; +, one specimen on a Cores 5 and 1A at depths of 211-220 meters, and Core number of slides; , a single isolated specimen. For the 2A at 220-229 meters, contain few poorly to moderately synchronopticon, lower-case letters define the same rela- preserved Radiolaria which are considered to be Ceno- tive abundances. manian or late Albian, and late Albian, respectively. All belong to the Dictyomitra somphedia Zone. Cores 3A (229-238 m) with few, poorly preserved Radiolaria, and RADIOLARIA FROM EACH SITE 4A (238-247 m) with common, moderately preserved Radiolaria from Site 303 with Table 1 Radiolaria, are Albian, and Aptian or Barremian, and are assigned to the Acaeniotyle umbilicata Zone. An Neogene abrupt change in the fauna from Cores 4A to 5A marks Only siliceous fossils are present in Cores 1-4 the transition to the Eucyrtis tenuis Zone. The remaining recovered from Site 303. Radiolaria are common and Cores 6A to 8A all belong to this zone. Cores 5A (247- well-preserved in all of them. 257 m) with common poorly preserved and 6A (257-266 Core 1, at a depth of 0-12 meters below the sediment m) with common moderately preserved Radiolaria are surface, is late Quaternary (Artostrobium tumidulum Aptian to Barremian and Aptian to Barremian or Hau- Zone). Core 2, at a depth of 62-71 meters, is early terivian, respectively. Cores 7A (266-275 m) and 8A Pliocene (Sphaeropyle langii Zone). Cores 3 and 4, at (275-284 m) contain a fauna similar to but sparser and depths of 117-126 and 173-182 meters, respectively, are more poorly preserved than that in Core 6A. TABLE 1 Occurrence and Abundance of Cretaceous Radiolaria at Site 303 21 41 19 1 43 31 16 28 26 39 38 3 36 12 18 53 42 5 51 59 64 52 62 54 27 67 17 40 4 O t3 ^ o I O K •S "I II K Si •2 ~ O ^ SJ «U 3 61 Rl p C C ao. ao. s s ^ <>? I a co co D. somph 5,CC - - CRO - - 2A,CC A. umbil. 3A,CC 4A, CC 5A.CC + C - - + E. tenuis 6A-1, 98-100 C M F F F - C 7A,CC F P R + R R C 8A, CC* RPR R + C Note: * Absences have not been reported from Sample 8A, CC because of the poor preservation and paucity of forms. O Suspected downward contamination. 580 RADIOLARIA Radiolaria from Site 304 with Table 2 respectively. Cores 5 and 6 belong to the Acaeniotyle umbilicata Zone and Cores 7-9 to the Eucyrtis tenuis Neogene Zone. Radiolaria are common and well preserved in Core 1. A well-preserved fauna is present in Samples 8-1, 130- Core 2 contains only fish teeth, except for a sample of 132 cm (pelagic clay) and 9-1, 101-103 cm (mudstone) moderate yellowish-brown pelagic clay (Core 2, Section with only a few elements in common with the radio- 1, 80-82 cm) probably representing cavings from up- larian fauna recovered from the chert. It resembles very hole, which contained common well-preserved much the fauna described by Tan Sin Hok (1927) from Radiolaria. No calcareous fossils are present in the the island of Roti and is considered contemporaneous Neogene section recovered from Hole 304. with the Radiolaria in the cherts, the only difference be- Core 1, at a depth of 106-115 meters below the sedi- ing the result of diversity in preservation. ment surface, is late Miocene (Stichocorys langii Zone) and the cavings of Core 2, at a depth of 216 meters, are Radiolaria from Site 305 with Table 3 mid-Miocene {Cannartus petterssonii Zone). Neogene Cretaceous Well-preserved Radiolaria are present in all of the five No siliceous fossils other than Radiolaria were Neogene cores recovered.
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